Re: remove undocumented assign syntax from plpgsql doc

2014/1/11 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>

> Bruce Momjian <bruce(at)momjian(dot)us> writes:
> > Oh, I think you are right. I have reverted the patch. Attached is
> > proposed documentation for '='.
>
> Meh. Variable initialization is only one of multiple cases (assignment,
> GET DIAGNOSTICS; maybe others, I've not examined the grammar). Also,
> if we do it like this, we're implying that both := and = are equally
> preferred, which might not be the impression we want to leave.
>

GET DIAGNOSTICS is defined by standard - and there "=" should be allowed
only - although we allow ":=" too. It is a embedded SQL statement -
although it is implemented as plpgsql statement.

Same situation is with UPDATE statement - we don't allow ":=" there.

>
> I'd be a bit inclined to just stick a NOTE somewhere saying that "="
> can be used in place of ":=" for assignment.
>

ok

If we accept it and we close this topic, then following comment should be
removed

assign_operator : '=' /* not documented because it might be removed
someday */
| COLON_EQUALS
;

Regards

Pavel

>
> regards, tom lane
>